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                box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
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        body {
            background-image: url('/images/background.jpg'); /* 假设图片放在public/images目录下 */
            background-size: cover;
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            background-attachment: fixed;
            background-repeat: no-repeat;
            z-index: -1;  /* 确保低于内容层级 */
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        body::before {
            display:none;
        }
        /* 添加下拉菜单样式 */
    #user-dropdown{
        border: 1px solid #e5e7eb;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
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    <header class="bg-primary text-white shadow-sm sticky top-0 z-50">
        <div class="container mx-auto px-4 py-3 flex justify-between items-center">
            <div class="flex items-center space-x-2">
                <i class="fa-solid fa-book-open text-white text-2xl"></i>
                <h1 class="text-xl font-bold text-white">在线练习系统</h1>
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            <h2 class="text-2xl font-bold text-white">做练习</h2>
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                background: linear-gradient(135deg, rgba(172, 166, 246, 0.7) 0%, rgba(170, 200, 226, 0.7) 100%);
                backdrop-filter: blur(10px);
                border: 1px solid rgba(200,220,255,0.3);
                box-shadow: 0 8px 20px rgba(0,50,150,0.03);">
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